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Tuft testing & vortex generators

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pchapman(at)ionsys.com
Guest

Posted: Thu Sep 25, 2008 11:30 am Post subject: Tuft testing & vortex generators

[I'm able to post again - Matt Dralle got me off a blacklist - 

Although I'm at a good ISP someone must have been spamming so my IP 

address range got blocked.]

Hi,

For anyone who is interested, I put together a web page showing 

photos and video of tuft testing on the 601 HDS I fly. Last weekend 

my dad and I finally got around to installing Stolspeed vortex 

generators on the wings, so there are before and after photos. It is 

mainly slow flight and approaches to the stall that are interesting 

in the recordings.



(It sure is handy when trying to put things on the web that companies 

like Google give away so much free server space, unlike my own  ISP 

that has never increased personal web space limits.)



The only other 601 tuft test pics I know of are from Viktor, a Swiss 

pilot, who has some good pics and vid on the Stolspeed.com site.



I don't have any fancy flight test data nor a good feel - after one 

flight -  for how the handling has changed. But it is clear that the 

airflow on the wing with VG's looks about the same as the no-VG wing 

at 10 mph higher.



At the bottom end of the airspeed indicator, with indicated speeds 

normally inaccurate on light aircraft, one can't read much into the 

numbers. It used to be that in slow flight with the power back we 

could get the indicated airspeed slightly below 40 mph before all the 

oil canning and wing rock and stall break set in. Now we can fly 

smoothly showing a ridiculous and inaccurate 30 mph before things get 

squirrely.



Whether the VG's are worthwhile over all is still to be determined, 

but they certainly have some effect in keeping the air attached to the wing.

http://sites.google.com/site/601cgzdc/Home/Tuft-testing--vortex-generators



Peter Chapman

Toronto, ON

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kmccune

Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

Posted: Thu Sep 25, 2008 12:09 pm Post subject: Re: Tuft testing & vortex generators

Thanks Peter good info !



Kevin

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